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Climate variations on the scale of hundreds of years may be caused by______: Changes in ocean currents
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Carbon dioxide has been locked up over geological time as______: Limestone and fossils
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Earth’s early greenhouse climate resulted in a climate much like that of ______ today: Venus
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Which one refers to the oceans, seas, rivers, fresh water and underground water? Hydrosphere
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Which of the following gases are included in the category “Greenhouse gases”? Methane, Nitrous oxide, Carbon dioxide
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Which type of energy transfer occurs between two substances in direct physical contact? Conduction
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Which two gases make up 99% of Earth’s atmosphere? Nitrogen and oxygen
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Which is the most abundant greenhouse gas in Earth’s atmosphere? Water vapor